<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        .abc{
            color: blue;
        }
        .p1{
            font-size: 50px;
        }
    </style>
</head>
<body>
    <p class="abc p1">123</p>

</body>
</html>